various fixes

include/unix.h

@@ -1,9 +1,22 @@
+#define __BSD_VISIBLE 1 /* FreeBSD 5.x */
+#define _BSD_SOURCE 1
+#define _NETBSD_SOURCE 1	/* NetBSD */
+#define _SVID_SOURCE 1
+#if !defined(__APPLE__) && !defined(__OpenBSD__)
+#	define _XOPEN_SOURCE 1000
+#	define _XOPEN_SOURCE_EXTENDED 1
+#endif
+#define _LARGEFILE64_SOURCE 1
+#define _FILE_OFFSET_BITS 64
+
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <math.h>
 #include <fcntl.h>
 #include <setjmp.h>
+#include <stddef.h>
 #include <time.h>
 #include <assert.h>
 #include <unistd.h>